Electricity storage device

Abstract

The utility model relates to an electrical storage device. The electrical storage device is provided with a plurality of electrical storage bodies and a storage shell. The plurality of power storage bodies are arranged in the X direction and stacked in the X direction. And the lower surface of the power storage body is bonded with the lower shell through a bonding piece. A protruding portion extending in the X direction is formed on the upper case. The protruding portion protrudes toward the lower case and comes into contact with the upper surface of the electricity storage body. As a result, the power storage body is pressed by receiving a load on the adhesive material side (lower case side).

Description

Technical Field

[0001] This disclosure relates to energy storage devices. Background Technology

[0002] Japanese Patent Application Publication No. 2023-46013 discloses a battery pack that uses an adhesive, thermally conductive component to bond multiple battery cells to the bottom of the casing.

[0003] If vibration or other forces are applied to the battery pack, there is a concern that the battery cells (storage elements) may peel off from the casing. Utility Model Content

[0004] The purpose of this disclosure is to provide a structure in which the adhesion between the energy storage element and the casing is not easily peeled off.

[0005] The energy storage device disclosed herein is an energy storage device comprising multiple energy storage elements and a housing, wherein the housing includes a first housing and a second housing, and multiple energy storage elements are housed within the space formed by the first housing and the second housing. The multiple energy storage elements are bonded to the first housing, and the second housing has a protrusion protruding toward the first housing, which abuts against the energy storage elements.

[0006] According to this configuration, multiple energy storage elements are bonded to the first housing. A protrusion of the second housing protrudes towards the first housing and abuts against the energy storage elements. Since the energy storage elements are pressed towards the first housing by the protrusion of the second housing, the adhesive peeling between the energy storage elements and the housing housing can be suppressed.

[0007] Preferably, multiple energy storage elements are arranged in the housing along the stacking direction, and the protrusions extend along the stacking direction.

[0008] According to this configuration, multiple energy storage elements can be pressed toward the first housing side through the protrusion of the second housing.

[0009] Each of the multiple energy storage elements can be a cuboid, and the central portion of the energy storage element along its long side is bonded to the first outer casing, with the protrusion abutting against the energy storage element at the central portion along its long side.

[0010] According to this configuration, the central part of the energy storage unit can be bonded to the housing casing.

[0011] The multiple energy storage components may each include: a cell connector for electrically connecting multiple energy storage cells arranged along a connection direction at a connection portion; a cell housing for housing the cell connector; and a reinforcing member disposed at the connection portion for reinforcing the cell housing. In this case, the protrusion of the second housing may abut against the cell housing at the location where the reinforcing member is disposed.

[0012] According to this configuration, since the protrusion abuts against the cell casing at the location where the reinforcing member is provided, the battery can be pressed well toward the first casing side.

[0013] Furthermore, the cell casing can be bonded to the first casing at the location where the reinforcing member is configured.

[0014] According to this configuration, since the cell casing is bonded to the first casing at the location where the reinforcing member is provided, the force applied to the energy storage body by the protrusion of the second casing is well transmitted to the bonded area through the reinforcing member.

[0015] According to this disclosure, a structure in which the adhesion between the energy storage element and the casing is not easily peeled off can be provided. Attached Figure Description

[0016] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, in which the same reference numerals denote the same elements, wherein,

[0017] Figure 1 This is a perspective view schematically representing the energy storage device involved in this embodiment.

[0018] Figure 2 This is a diagram schematically representing an example of a battery 10.

[0019] Figure 3A yes Figure 1 Sectional view III-III.

[0020] Figure 3B yes Figure 1 Sectional view III-III.

[0021] Figure 4 This is an exploded perspective view of the energy storage body involved in Embodiment 2.

[0022] Figure 5 This is a cross-sectional view of the energy storage device according to Embodiment 2.

[0023] Figure 6 This is a perspective view schematically representing the energy storage device 1B in the modified example. Detailed Implementation

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same or equivalent parts are labeled with the same reference numerals, and their descriptions are not repeated. The drawings are not illustrated according to actual dimensions; in order to facilitate understanding of the structure, there are cases where the scale is changed in a way that makes the structure clear. The embodiments and variations described below can also be selectively combined as appropriate.

[0025] [Implementation Method 1]

[0026] Reference Figures 1 to 3B The energy storage device involved in this embodiment will be described. Figure 1 This is a perspective view schematically representing the energy storage device involved in this embodiment.

[0027] Reference Figure 1 The energy storage device 1 is used, for example, in a vehicle. Examples of vehicles include hybrid vehicles, plug-in hybrid vehicles, fuel cell vehicles, and electric vehicles. The energy storage device 1 includes multiple energy storage cells 10 and a housing 20 for housing the multiple energy storage cells 10.

[0028] The energy storage element 10 is a secondary battery, typically a lithium-ion battery. A lithium-ion battery is a battery that uses lithium as a charge carrier. Besides general lithium-ion secondary batteries with a liquid electrolyte, it also includes so-called all-solid-state batteries that use a solid electrolyte. Examples of lithium-ion batteries include LFP batteries using lithium iron phosphate as the positive electrode active material, and ternary batteries using NMC (nickel-manganese-cobalt) as the positive electrode active material. Furthermore, the energy storage element 10 is not limited to lithium-ion secondary batteries; it can also be composed of nickel-metal hydride secondary batteries or other types of secondary batteries.

[0029] Figure 2 This diagram schematically illustrates an example of an energy storage device 10. In this embodiment, the energy storage device 10 is a stacked lithium-ion battery in which multiple battery cells are stacked inside a cell casing. These battery cells are formed by stacking a positive electrode sheet (current collector) coated with a positive electrode active material and a negative electrode sheet (current collector) coated with a negative electrode active material, separated by a separator. Alternatively, it can be a bipolar lithium-ion battery in which a positive electrode active material is coated on one side of the current collector, a negative electrode active material is coated on the other side of the current collector, and they are stacked separated by a separator.

[0030] Reference Figure 2 The energy storage element 10 is a cuboid, including an upper surface 11, a lower surface 12, a pair of short side surfaces 13 and 14, and a pair of long side surfaces 15 and 16, with the longest side extending along the Y direction. The energy storage element 10 also includes a positive terminal 17 and a negative terminal 18. The positive terminal 17 is located on one of the short side surfaces 13 and 14, and the negative terminal 18 is located on the other side of the pair of short side surfaces 13 and 14. Figure 2 In the example shown, the positive terminal 17 is located on the short side 14, and the negative terminal 18 is located on the short side 13. Alternatively, both the positive terminal 17 and the negative terminal 18 may be located on one of the short sides 13 and 14.

[0031] Reference Figure 1The housing 20 includes an upper housing 21 and a lower housing 22. The lower housing 22 includes a bottom plate and a peripheral wall. The bottom plate is flat. The peripheral wall extends upward from the outer periphery of the bottom plate and is annular. Multiple energy storage cells 10 are housed within the space formed by assembling the upper housing 21 to the lower housing 22. Figure 1 The diagram shows the energy storage device 1 with the upper casing 21 removed. The upper casing 21 corresponds to an example of the "second casing" of this disclosure, and the lower casing 22 corresponds to an example of the "first casing" of this disclosure.

[0032] The energy storage element 10 is housed in the housing housing 20 by being arranged and stacked along the X direction in the space formed by the upper housing 21 and the lower housing 22. In this embodiment, the X direction corresponds to the "stack direction" of this disclosure.

[0033] Figure 3A , Figure 3B yes Figure 1 Sectional view III-III. Figure 3A This is an example of bonding the central portion of the long side of the battery 10. Figure 3B This is an example of bonding the entire battery cell 10 together.

[0034] Reference Figure 3A The lower surface 12 of the battery 10 and the lower shell 22 are bonded together by an adhesive 30 at approximately the center of the long side of the battery 10. A protrusion P extending in the X direction (lamination direction) is formed on the upper shell 21. The protrusion P protrudes towards the lower shell 22. The protrusion P abuts against the upper surface 11 of the battery 10 at approximately the center of the long side of the battery 10. The adhesive 30 and the protrusion P are positioned to overlap in the Z direction.

[0035] Reference Figure 3B The lower surface 12 of the battery 10 is bonded to the lower shell 22 by an adhesive 30a. The adhesive 30a bonds almost the entire lower surface 12 of the battery 10 to the lower shell 22. A protrusion P extending in the X direction (lamination direction) is formed on the upper shell 21. The protrusion P protrudes towards the lower shell 22. The protrusion P abuts against the upper surface 11 of the battery 10 at approximately the center of its long side.

[0036] according to Figure 3A , Figure 3B The structure allows the protrusion P of the upper shell 21 to abut against the upper surface 11 of the battery 10, thereby pressing the battery 10 under load on the adhesive side (lower shell 22 side). This prevents the battery 10 from peeling off from the housing 20 (lower shell 22). Furthermore, in Figure 3AIn this structure, since the adhesive 30 and the protrusion P are arranged to overlap in the Z direction, even when the central part of the long side of the battery 10 is bonded to the lower shell 22, the adhesive peeling between the battery 10 and the housing shell 20 (lower shell 22) can be well suppressed.

[0037] In addition, Figure 3A , Figure 3B In this structure, a cooler for cooling the energy storage element 10 can also be arranged in the space between the upper shell 21 and the upper surface 11 of the energy storage element 10. Additionally, in... Figure 3A In the structure, a cooler can also be arranged between the lower surface 12 of the energy storage body 10 and the lower shell 22 on both sides of the adhesive part 30 in the Y direction.

[0038] [Implementation Method 2]

[0039] Figure 4 This is an exploded perspective view of the energy storage unit 10A according to Embodiment 2. In Embodiment 2, the energy storage unit 10A includes a cell connector 50 that electrically connects a plurality of energy storage cells 100 at a connection portion 110. The energy storage cells 100 are, for example, lithium-ion batteries. The energy storage cells 100 are, for example, composed of an electrode body and a laminated outer casing 160 that seals the electrode body. The electrode body is composed of a wound body formed by winding a positive electrode sheet coated with a positive electrode active material and a negative electrode sheet coated with a negative electrode active material through a separator.

[0040] The battery cell 100 has current collector terminals 140 at both ends in the Y direction (one is a positive terminal and the other is a negative terminal). The current collector terminals 140 of adjacent battery cells 100 are connected in series at the connection portion 110, thereby forming a battery cell connector 50. By inserting the battery cell connector 50 into the battery cell housing 300 and engaging the cover member 310 with the battery cell housing 300, the battery cell connector 50 is housed in the battery cell housing 300 to form a battery cell 10A. Figure 4 A perspective view is shown when the cell connector 50 is inserted into the cell housing 300. The battery 10A consists of a cell connector 50, which electrically connects a plurality of battery cells 100 arranged in the Y direction (connection direction), and a cell housing 300 that houses the cell connector 50.

[0041] A pair of reinforcing members 200 are provided at the connection portion 110 of the cell connector 50, clamping the current collector terminal 140. Each reinforcing member 200 is a hollow quadrangular prism in the Z direction. The reinforcing member 200 can be made of synthetic resin or metal. The length of the reinforcing member 200 in the Z direction is the same as the width of the inner surface of the cell casing 300 in the Z direction. Thus, the reinforcing member 200 functions as a reinforcing member (so-called support rod) of the cell casing 300 at the connection portion 110 of the cell connector 50.

[0042] Output terminals 400 (one is the positive terminal and the other is the negative terminal) are connected to the collector terminals 140 on both sides of the cell connector 50. Alternatively, a pair of reinforcing members 210, identical to the reinforcing member 200, can be provided to sandwich the collector terminals 140 on both sides of the cell connector 50.

[0043] Figure 5 This is a cross-sectional view of the energy storage device 1A according to Embodiment 2. This cross-sectional view is... Figure 3A , Figure 3B A cross-sectional view of the same area. In Embodiment 2, the cell connector 50 is composed of three battery cells 100. The housing 20A includes an upper shell 21A and a lower shell 22A. The plurality of battery cells 10A are housed in the housing 20A by being arranged along the X direction and stacked in the space formed by the upper shell 21A and the lower shell 22A.

[0044] The lower surface 12A of the battery cell 10A (cell housing 300) is bonded to the lower housing 22A by adhesive members 30A, 30A. Adhesive members 30A are positioned at the location where the reinforcing member 200 is disposed (at the connection portion 110 of the cell connector 50), bonding the battery cell 10A to the lower housing 22A. Protrusions P1 and P2 extending in the X direction (lamination direction) are formed on the upper housing 21. Protrusions P1 and P2 protrude towards the lower housing 22A. Protrusions P1 and P2 abut against the upper surface 11A of the battery cell 10A (cell housing 300). Adhesive members 30A, 30A and protrusions P1 and P2 are positioned in an overlapping manner in the Z direction.

[0045] According to this embodiment 2, the protrusions P1 and P2 of the upper shell 21A abut against the upper surface 11A of the battery cell 10A (cell housing 300), causing the battery cell 10A to bear the load and be pressed by the adhesive member 30A (lower shell 22A side). This suppresses the adhesive peeling between the battery cell 10A and the housing housing 20A (lower shell 22A). Furthermore, the protrusions P1 and P2 and the adhesive members 30A and 30A are positioned to overlap in the Z-direction at the location where the reinforcing member 200 is located. Therefore, the force applied to the battery cell 10A (cell housing 300) by the protrusions P1 and P2 is efficiently transmitted to the adhesive members 30A and 30A (adhesive portions) through the reinforcing member 200, further suppressing the adhesive peeling between the battery cell 10A and the housing housing 20A (lower shell 22A).

[0046] Furthermore, in embodiment 2, the battery cell connector 50 is composed of three battery cells 100, but the number of battery cells 100 can be two or more.

[0047] [Variation Example]

[0048] Figure 6 This is a schematic perspective view of the energy storage device 1B in a modified example. In the modified energy storage device 1B, a plurality of partition walls 61, 62, and 63 are formed in the lower shell 22B of the housing 20B. The partition walls 61 and 62 are formed to extend along the X direction, and the partition wall 63 is formed in the central part of the lower shell 22B in the X direction, extending in the Y direction. The plurality of energy storage elements 10 have the same configuration as in Embodiment 1. The energy storage elements 10 are arranged along the Y direction and stacked between the partition walls 61 and 62, thereby being housed in the housing 20B. In addition, the energy storage elements 10 are arranged in two rows by being divided by the partition walls 63.

[0049] Each battery cell 10 is bonded to the bottom surface of the lower housing 22B via an adhesive. Protrusions P3 and P4 extending in the Y direction (lamination direction) are formed on the upper housing 22B. Protrusions P3 and P4 protrude towards the lower housing 22B. Protrusions P3 and P4 abut against the battery cell 10 at approximately the center of its long side.

[0050] In this modified example, the protrusions P3 and P4 of the upper shell 21B also abut against the battery 10, causing the battery 10 to be pressed under load on the adhesive side (lower shell 22B side). This suppresses the adhesion peeling between the battery 10 and the housing shell 20B (lower shell 22B).

[0051] Furthermore, in the above embodiments, a portion of the energy storage element (e.g., the energy storage element at the end in the stacking direction) may not abut against the protrusion formed on the upper shell.

[0052] All points in the disclosed embodiments should be considered illustrative and not intended to limit the scope of the present invention. The scope of the present invention is not limited by the foregoing description, but is defined by the technical solutions and is intended to include equivalents and all modifications within its scope.

Claims

1. An electricity storage device, comprising: a plurality of electricity storage bodies; and a housing including a first housing and a second housing, and housing the plurality of electricity storage bodies in a space formed by the first housing and the second housing, characterized in that: the plurality of electricity storage bodies are bonded to the first housing, the second housing has a protruding portion protruding toward the first housing, and the protruding portion is in abutment with the electricity storage bodies.

2. The electricity storage device according to claim 1, characterized in that: the plurality of electricity storage bodies are arranged in a stacking direction in the housing, and the protruding portion extends in the stacking direction.

3. The electricity storage device according to claim 1 or 2, characterized in that: the plurality of electricity storage bodies are each a cuboid, the electricity storage bodies are bonded to the first housing at a central portion in a long side direction, and the protruding portion is in abutment with the electricity storage bodies at a central portion in the long side direction.

4. The electricity storage device according to claim 1 or 2, characterized in that: the plurality of electricity storage bodies each include: an electricity core connecting body electrically connecting a plurality of electricity storage cores arranged in a connecting direction at a connecting portion; an electricity core housing housing the electricity core connecting body; and a reinforcing member disposed at the connecting portion and configured to reinforce the electricity core housing, and the protruding portion is in abutment with the electricity core housing at a position at which the reinforcing member is disposed.

5. The electricity storage device according to claim 4, characterized in that: the electricity core housing is bonded to the first housing at the position at which the reinforcing member is disposed. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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